OZMON wrote:
I am thinking of buying the Nikon 18-200mm dx lens for my d3300, I like landscape photography, is it a good lens for this subject?.
For landscape photography specifically, I would find the short to moderately long telephoto, 56-200mm range of focal lengths that lens would give you next to worthless. It certainly wouldn't be my choice!
While some landscape photography can be done with telephotos, that's rather specialized. Your images will be much better if you get closer to those mountains, shooting through less atmosphere and incorporate some foreground objects in the images. To do that, personally I find wide angle lenses MUCH more useful for landscape photography. Your 16-85mm only goes "moderately wide", so I'd recommend an AF-P Nikkor 10-20mm DX VR lens instead. It's reasonably compact, light weight and affordable at around $300.
Now, 10mm versus 16mm doesn't sound like a lot... but at the wide angle end of things, a single millimeter makes noticeable difference. (It wouldn't, in the telephoto range.)
I'm assuming AF-P lenses are compatible with D3300.... I don't know for certain, so be sure to check compatibility charts on Nikon websites and elsewhere.
If not compatible, instead look at some of the third party ultrawides such as the Tokina 11-20mm f/2.8 (rather large/heavy), Tokina 12-28mm f/4 (more reasonable size/weight, though still heavier than the Nikkor 10-20mm), Sigma 10-20mm f/3.5 (another rather large/heavy lens) or the Tamron 10-24mm "VC". All these are current models being offered.
Nikon also offers the AF-S 10-24mm and AF-S 12-24mm Nikkors... But both of those are ridiculously expensive. As AF-S lenses, I am certain both are fully compatible with your camera. But unless you get a "steal" on a used one in good shape, at double the price and more of some of the other lenses mentioned here, they are VERY pricey.
If you shop used, you'll also find older Tokina 11-16mm and 12-24mm models.... Those are quite decent, well built lenses but you need to be aware that for use on Nikon D3300 you would need the "II" versions of either, if you want autofocus. The sometimes-cheaper original versions of those lenses do not have a built-in focusing motor, so would be manual-focus-only on your camera. The "II" versions of each have the in-lens motor, so will be able to autofocus. These are all discontinued models (replaced by the two Tokina models above), so you're less likely to see them anywhere other than the used market, though I have noticed occasional "new old stock" of all four models.
Also sometimes seen on the used market, there also were much earlier Tamron 11-18mm (not a very good lens) and earlier Tamron 10-24mm non-VC (a bit better, tho not as good as the newer VC version). There also have been a smaller/lighter Sigma 10-20mm f/4.5-5.6 (discontinued) and a more expensive, extremely wide angle Sigma 8-16mm (still in production, but with much more perspective exaggeration). Finally there is Sigma's 12-24mm (both current "Art" and one or two earlier versions), but that's actually a much more expensive full frame (FX) lens and would be somewhat of a waste of money to use on a DX camera like yours.
Something else I find invaluable for landscape photography is a high quality circular polarizer filter. It serves many purposes... reducing reflections off water and foliage, richer and more saturated colors, deeper blue skies and more. The effect can be uneven using one with an ultrawide lens (depends upon the position of the sun), but that can be worked with or worked around. I recommend B+W XS-Pro or F-Pro CPL in whatever size is needed for the lens you choose. For example, the Nikkor10-20mm uses 72mm filters, which cost around $80 in those B+W series... the XS-Pro is a "slim" filter, which might be needed to prevent vignetting on some ultrawides.